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Mark Grover commented on SPARK-18016:
-------------------------------------
Thanks for working on this [~aeskilson]. [~cloud_fan], [~rxin] something seems off w.r.t the
versions this change is in. Seems like it was committed to 2.1 and 2.2 branches and then later
taken out of 2.2 branch because it was deemed too risky. That all makes sense, but I believe
this change is still in the 2.1 branch. In order to make sure, we have no regression in 2.2,
we need to revert this from 2.1 branch as well.
And, accordingly we should adjust the fixed version here on this JIRA to be 2.3.
> Code Generation: Constant Pool Past Limit for Wide/Nested Dataset
> -----------------------------------------------------------------
>
> Key: SPARK-18016
> URL: https://issues.apache.org/jira/browse/SPARK-18016
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Aleksander Eskilson
> Assignee: Aleksander Eskilson
> Fix For: 2.1.2, 2.2.0
>
>
> When attempting to encode collections of large Java objects to Datasets having very wide
or deeply nested schemas, code generation can fail, yielding:
> {code}
> Caused by: org.codehaus.janino.JaninoRuntimeException: Constant pool for class org.apache.spark.sql.catalyst.expressions.GeneratedClass$SpecificUnsafeProjection
has grown past JVM limit of 0xFFFF
> at org.codehaus.janino.util.ClassFile.addToConstantPool(ClassFile.java:499)
> at org.codehaus.janino.util.ClassFile.addConstantNameAndTypeInfo(ClassFile.java:439)
> at org.codehaus.janino.util.ClassFile.addConstantMethodrefInfo(ClassFile.java:358)
> at org.codehaus.janino.UnitCompiler.writeConstantMethodrefInfo(UnitCompiler.java:11114)
> at org.codehaus.janino.UnitCompiler.compileGet2(UnitCompiler.java:4547)
> at org.codehaus.janino.UnitCompiler.access$7500(UnitCompiler.java:206)
> at org.codehaus.janino.UnitCompiler$12.visitMethodInvocation(UnitCompiler.java:3774)
> at org.codehaus.janino.UnitCompiler$12.visitMethodInvocation(UnitCompiler.java:3762)
> at org.codehaus.janino.Java$MethodInvocation.accept(Java.java:4328)
> at org.codehaus.janino.UnitCompiler.compileGet(UnitCompiler.java:3762)
> at org.codehaus.janino.UnitCompiler.compileGetValue(UnitCompiler.java:4933)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:3180)
> at org.codehaus.janino.UnitCompiler.access$5000(UnitCompiler.java:206)
> at org.codehaus.janino.UnitCompiler$9.visitMethodInvocation(UnitCompiler.java:3151)
> at org.codehaus.janino.UnitCompiler$9.visitMethodInvocation(UnitCompiler.java:3139)
> at org.codehaus.janino.Java$MethodInvocation.accept(Java.java:4328)
> at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:3139)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:2112)
> at org.codehaus.janino.UnitCompiler.access$1700(UnitCompiler.java:206)
> at org.codehaus.janino.UnitCompiler$6.visitExpressionStatement(UnitCompiler.java:1377)
> at org.codehaus.janino.UnitCompiler$6.visitExpressionStatement(UnitCompiler.java:1370)
> at org.codehaus.janino.Java$ExpressionStatement.accept(Java.java:2558)
> at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:1370)
> at org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:1450)
> at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:2811)
> at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:1262)
> at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:1234)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:538)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:890)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:894)
> at org.codehaus.janino.UnitCompiler.access$600(UnitCompiler.java:206)
> at org.codehaus.janino.UnitCompiler$2.visitMemberClassDeclaration(UnitCompiler.java:377)
> at org.codehaus.janino.UnitCompiler$2.visitMemberClassDeclaration(UnitCompiler.java:369)
> at org.codehaus.janino.Java$MemberClassDeclaration.accept(Java.java:1128)
> at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:369)
> at org.codehaus.janino.UnitCompiler.compileDeclaredMemberTypes(UnitCompiler.java:1209)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:564)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:420)
> at org.codehaus.janino.UnitCompiler.access$400(UnitCompiler.java:206)
> at org.codehaus.janino.UnitCompiler$2.visitPackageMemberClassDeclaration(UnitCompiler.java:374)
> at org.codehaus.janino.UnitCompiler$2.visitPackageMemberClassDeclaration(UnitCompiler.java:369)
> at org.codehaus.janino.Java$AbstractPackageMemberClassDeclaration.accept(Java.java:1309)
> at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:369)
> at org.codehaus.janino.UnitCompiler.compileUnit(UnitCompiler.java:345)
> at org.codehaus.janino.SimpleCompiler.compileToClassLoader(SimpleCompiler.java:396)
> at org.codehaus.janino.ClassBodyEvaluator.compileToClass(ClassBodyEvaluator.java:311)
> at org.codehaus.janino.ClassBodyEvaluator.cook(ClassBodyEvaluator.java:229)
> at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:196)
> at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:91)
> at org.apache.spark.sql.catalyst.expressions.codegen.CodeGenerator$.org$apache$spark$sql$catalyst$expressions$codegen$CodeGenerator$$doCompile(CodeGenerator.scala:905)
> ... 35 more
> {code}
> During generation of the code for SpecificUnsafeProjection, all the mutable variables
are declared up front. If there are too many, it seems it perhaps exceeds some type of resource
limit.
> This issue seems related to (but is not fixed by) SPARK-17702, which itself was about
the size of individual methods growing beyond the 64 KB limit. SPARK-17702 was resolved by
breaking extractions into smaller methods, but does not seem to have resolved this issue.
> I've created a small project [1] where I declare a list of "wide" and "nested" Bean objects
that I attempt to encode to a Dataset. This code can trigger the failure for Spark 2.1.0-SNAPSHOT.
> [1] - https://github.com/bdrillard/spark-codegen-error
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